WinBridge
WinBridge Bluetooth Voice Amplifier for Teachers, Wireless Voice Amplifier with Bluetooth Headset Microphone, Portable Megaphone Speaker Headset System Teacher Microphone 15W/1500mAh WB002
Norwii
NORWII S358 Portable 2000mAH Rechargeable Voice Amplifier with Wired Microphone Headset & Waistband, Personal Microphone and Speaker for Teachers Tour Guides ect (Black)
WinBridge
20W Wireless Bluetooth Voice Amplifier for Teachers Portable Waterproof Voice Amp Wireless Headset Microphone and Speaker Set Personal Mic for Classroom M801
WinBridge
Voice Amplifier with Microphone Headset Clip Amp Portable Bluetooth Speaker Waterproof IPX5 for Outdoors Activities, Teaching, Meetings, Training M800 (Wired Mic_Green)